Nomination pool configurations can be managed by custom origin (#3959)
closes https://github.com/paritytech/polkadot-sdk/issues/3894 Allows Nomination Pool configuration to be set by a custom origin instead of root. In runtimes, we would set this to be `StakingAdmin`, same as for pallet-staking. --------- Co-authored-by:Liam Aharon <[email protected]>